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Regulatory Matters - Ohio (Details)
$ in Millions
9 Months Ended 12 Months Ended
Nov. 14, 2016
USD ($)
Oct. 12, 2016
USD ($)
Apr. 15, 2016
Aug. 07, 2013
USD ($)
auction
Sep. 30, 2016
Dec. 31, 2016
USD ($)
MWh
Regulatory Matters [Line Items]            
Proposed reduction in power plants carbon pollution (percent)         90.00%  
Ohio            
Regulatory Matters [Line Items]            
Annual energy savings | MWh           1,990
EEPP term of plan     3 years      
Portfolio plan estimated cost           $ 268.0
Credit to non-shopping customers       $ 43.4    
Ohio | Year 2015            
Regulatory Matters [Line Items]            
Annual energy savings | MWh           486
Ohio | Year 2017            
Regulatory Matters [Line Items]            
Annual energy savings yearly increase (percent)           1.00%
Ohio | Annually Through 2020            
Regulatory Matters [Line Items]            
Utilities required to additionally reduce peak demand           0.75%
Ohio | Distribution Modernization Rider            
Regulatory Matters [Line Items]            
Rider valuation $ 558.0          
Rider valuation period 8 years          
Ohio | PUCO            
Regulatory Matters [Line Items]            
Proposed reduction in power plants carbon pollution (percent)   90.00%        
Number of renewable energy auctions | auction       1    
Ohio | PUCO | Distribution Modernization Rider            
Regulatory Matters [Line Items]            
Annual revenue cap for rider   $ 132.5        
Cost recovery period   3 years        
Possible extension period   2 years        
Approved annual revenue cap amount for rider   $ 204.0        
Excessive earnings test cost recovery exclusion period   3 years        
Potential extension period for excessive earnings test cost recovery   2 years        
Ohio | PUCO | DCR Rider            
Regulatory Matters [Line Items]            
Increased annual revenue cap for rider   $ 30.0        
Revenue cap for Rider for years 3-6   20.0        
Revenue cap for Rider for years 6-8   15.0        
Ohio | PUCO | Energy Conservation, Economic Development and Job Retention            
Regulatory Matters [Line Items]            
Contribution amount   $ 51.0